Gate valve



April 20 1926. 'Y 1,581,654

' M. l. MIX

GATE VALVE Filed June 8, 1925' ".J Nfl/zig, Z

60, i; Ww 601- ZZ Z0 Patented Apr. 20, 1926.

UNITED STATES MARTIN I. MIX, OF CHICAGO, ILLINOIS.

GATE VALVE.

Application led June 8, 1925. Serial No. 35,521.

To all whom t may concern:

Be it known that I, MARTIN I. MIX, a citizen of the United States,residing at- Chicago, in the county of Cook and VState of Illinois, haveinvented a certain new and useful Gate Valve, of which the following isa speciiication.

My invention relates'to gate valvesadapted to control the flow of fluid,in liquid or gaseous form, in pipe lines.

Gate valves as heretofore constructed, consist mainly of a casingcomprising a valve chamber having seats at the opposite ends thereof anda gate adapted to engage said seats to close the valve. The casing isprovided with a bonnet on one side of the valve chamber to permit thegate to be completely withdrawnfrom the chamber by means of a handoperated screw' stem extending through theI bonnet and through asuitable packing box on the casing. The

- stem is ordinarily provided with a hand wheel at its outer end.

It is the general object of the invention to provide a new andimprovedgate valve with means to protect the threaded stem and bearing partsfrom corrosion. 4

It is a further object of the invention to provide a new and improvedvalve having a lubricant reservoir in the gate, 'surrounding the stem,and means on the valve casing to permit introduction of a lubricant tothis reservoir.

Further objects and advantages of my invention will be understood fromthe following detailed description taken in connection with theaccompanying drawings which form a part of this specification, inwhich-4 Figure 1 is a side view of one form ofy my invention in centralsection.

Figure '2 is a sectional view taken along the line 22 of Fig. 1 lookingin the direction of the arrows. y

Fig. 3 is a sectional view t-aken along the line 3-3 of Fig. 1 lookingin the direction of the arrows.

-While my invention is susceptibleof embodiment inl many differentforms, I have shown in the drawings and will herein describe in detailone such embodiment, with the understanding that the present disclosureis to be considered asan exemplification of the principles of theinvention and is not intended to limit the invention to the embodimentillustrated.- The scope of the invention will be pointed out in the ap'pended claims.

Referring to the accompanying drawings, my invention in the exemplaryform is shown as comprising a casing 1 having a channel 2 therethroughfor the passage of a Huid. This casing has valve seats 3 surrounding thechannel 2 and may be provided `with the usual flanges 4 forattachment-'in a pipe line. A suitable gate, herein shown as a wedgeshaped valve member 5 is adapted to coact with the seats 3 to close thechannel 2.

vMeans is provided to open land close the gate v5, said means as shownherein comprising a rotatable stem 6 having a hand wheel 6n thereon,said stem being prevented from moving longitudinally by a thrust bearing7 at its `outer end secured in a suitable packing box attached to thecasing and herein designated generally as 8. A threaded portion 9 of thestem 6 engages a nut 10 secured at the bottom of the gate 5, the'rotation of said stem thereby operating said gate.

The casing 1 is T shaped, having in addition to thechannel 2 a recess 11on the side of said channel opposite the thrust bearing 7 said recessbeing herein shown as formed by a housing 12 suitably attached to thecasing 1 as by bolts 13. This housing 12, which serves as a receptaclefor any sediment lor foreign matter when the valve is in its normalposition, as well as to enclose the gate when the valve is open, isprovided with openings such as 14 and 15, having suitable closures, topermit convenient draining land flushing out of `such sediment o-rmatter. The casing 1 is preferably provided with vertical guide ribs 16forming tongues adapted to engage in suitablev grooves 1 in the gate 5so as tc guide the gate in its reciprocatory path into and out ofengagement with the seats 3. At the bottom of the casing there isprovided a socket 18 toact as a. lower bearing for the stem 6.

The gate l5 has a cavity 19 surrounding the stem 6, which is adapted tocontain a lubricant to lubricate the stem 6 and nut 10, and therebyprevent corrosion thereof. Suitable ducts 20 and 21 are provided in thecasing 1 a id gate 5 respectively so as to register when the gate is inits uppermost position as shown in Fig. 2, and thus permit a lubricantto be fed into the cavlty 19.

It will be seen that the recess below the ros channel providsor thecollection of any sediment or foreign matter so that it does notinterfere with the proper operation of the valve, and such sediment mayeasily be removed when desired without removing the valve from the pipeline. This position of the recess also permits the hand wheel to bepositioned immediately adjacent the fluid channel, Ithereby requ1ringbut little head room for vertical operatlon of the valve andpermittingvertical operation in practically all applications. The stem is in ten-'sion when the valve -is being closed and therefore is incapable ofbuckling. Also it will be observed, the stem is, in eect, shortened toabout one half its normal length at the moment of greateststrain in thatonly the ortion of the stem between the nut 10 in t e gateand the thrustbearing 7 is in tension to com lately-close the valve or in compressionto egin to open it.

I claim as my invention:

1. A gate valve having, in combination, a casing with a channeltherethrough, a seat surrounding said channel, a valve member -operableto engage said seat to close said channel, said casing having a recesson one side of said channel into which said valve member may becompletely withdrawn from the channel, a valve stem ada ted to operatesaid valve member, said vallile stem being supported in said casing at apoint opposite said recess for rotational movement and means tolubricate said stem comprising a reservoir formed in said valve memberand surrounding said stem and a duct formed in said'casing adapted to.connect with said reservoir.

2. A gate valve having, in combination, a casing having a channeltherethrough, a valve member adapted to close said chan nel, said casinghaving a recess on one side of said channel into which said valve memberma be completely withdrawn from said channe, a valveV stem adapted tooperate said valve member, said valve member being constructed to form areservoir surrounding said stem adapted to contain a lubricant, andmeans in said casing adapted to permit introduction of a lubricant intosaid reservoir when said valve is in its closed osition.

In testimony whereof, I have ereunto affixed my signature. MARTIN I.MIX.

